Just going by the reviews, the '962 doesn't have the best reputation in the world. It seems to do well if input power is less than 300-400 watts but not for much over that. I have no direct experience with either tuner but have known of quite a few of the '989's that were working at legal limit with no troubles. So, just going by hear-say, and if price wasn't a biggy, I think I'd opt for the '989.
Take that opinion for what it's worth, and I don't think it's worth a lot...
- 'Doc